| Sine ___ (indefinitely) | 23 |
| Sine ___ (timeless): Lat. | 25 |
| Sine's reciprocal: Abbr. | 28 |
| Sine, cosine and tangent | 24 |
| Sine, cosine or tangent | 23 |
| Sine, cosine, or tangent | 24 |
| Sine–non connection | 26 |
| Sinecures for ward heelers | 26 |
| Sinful city of Scripture | 24 |
| Sing "nyah-nyah" to | 29 |
| Sing "shooby-doo" | 27 |
| Sing -- (croon by oneself) | 26 |
| Sing -- (vocalize alone) | 24 |
| Sing a siren's song | 23 |
| Sing by changing register | 25 |
| Sing cowboy songs, maybe | 24 |
| Sing door-to-door in December | 29 |
| Sing Dufourspitze-style | 23 |
| Sing from the mountaintops | 26 |
| Sing in a carefree way | 22 |
| Sing in a full, happy voice | 27 |
| Sing in a low, gentle tone | 26 |
| Sing in certain syllables | 25 |
| Sing in the snow, perhaps | 25 |
| Sing like a mountaineer | 23 |
| Sing like an Austrian, maybe | 28 |
| Sing like Ella Fitzgerald | 25 |
| Sing like Harry Connick Jr. | 27 |
| Sing like Leonard Cohen | 23 |
| Sing like Mel Tormé | 22 |
| Sing like Michael Bublé | 26 |
| Sing like the birdies sing | 26 |
| Sing nonsense syllables | 23 |
| Sing one's own praises | 26 |
| Sing one's praises | 22 |
| Sing or string follower | 23 |
| Sing Sing warden-author | 23 |
| Sing Sing's famed warden | 28 |
| Sing softly and soothingly | 26 |
| Sing to a Saint Bernard | 23 |
| Sing tones of the scale | 23 |
| Sing using nonsense syllables | 29 |
| Sing with dulcet tones | 22 |
| Sing with made-up words | 23 |
| Sing, Alpine style: Var. | 24 |
| Sing, as a Gregorian chant | 26 |
| Sing, but not operatically | 26 |
| Sing, thirties' style | 25 |
| Sing, without feeling? | 22 |
| Singapore disciplinarian | 24 |
| Singapore natives, e.g. | 23 |
| Singapore sling ingredient | 26 |
| Singapore sling liquor | 22 |
| Singapore ___ (bar drink) | 25 |
| Singapore ___ (cocktail) | 24 |
| Singapore ___ (gin drink) | 25 |
| Singapore's location | 24 |
| Singapore's peninsula | 25 |
| Singaporean or Hong Konger | 26 |
| Singaradja's island | 23 |
| Singaraja is its capital | 24 |
| Singaraja's island | 22 |
| Singer "Weird Al" | 27 |
| Singer (WWII rifleman) | 22 |
| Singer -- 'King' Cole | 29 |
| Singer / actress in Africa? | 27 |
| Singer Acuff or Orbison | 23 |
| Singer after getting seasick? | 29 |
| Singer aka Sasha Fierce | 23 |
| Singer Al after a jog? | 22 |
| Singer Al's style? | 22 |
| Singer Almond or actor Singer | 29 |
| Singer Amos and others | 22 |
| Singer Amy with six Grammys | 27 |
| Singer and actress Luft | 23 |
| Singer and conductor McFerrin | 29 |
| Singer and part-time reporter | 29 |
| Singer Anderson and others | 26 |
| Singer Anderson, to her kids? | 29 |
| Singer Anita and family | 23 |
| Singer Anita from Chicago | 25 |
| Singer Artis Ivey, familiarly | 29 |
| Singer at Diana's funeral | 29 |
| Singer at the chess match? | 26 |
| Singer backed by the Aliis | 26 |
| Singer Baker or Bryant | 22 |
| Singer Baker or O'Day | 25 |
| Singer Barbara of Houston | 25 |
| Singer Basil or Braxton | 23 |
| Singer behind prison walls? | 27 |
| Singer Bob Marley, e.g. | 23 |
| Singer Bobby and family | 23 |
| Singer Bobby and others | 23 |
| Singer Bobby ___: 1936-73 | 25 |
| Singer Bobby: 1936–73 | 28 |
| Singer born Anna Mae Bullock | 28 |
| Singer born Clara Ann Fowler | 28 |
| Singer born Dec. 12, 1915 | 25 |
| Singer born February 26 1932 | 29 |
| Singer born in Gaoth Dobhair | 28 |